Titanium and Hastelloy 2

[topgun67]

Hi,
I have been asked to replace an existing carbon steel sea water cooling line with a Titanium one. It is 200mm nb. Fitings and elbows in Titanium are impossible to procure. Hastelloy is more readily available. Does anybody have any thoughts on Hastelloy or maybe 316l Stainless as an alternative to Titanium? This is on UK Nuclear power station
Thanks for your time

 

[metengr]

You have several other alloy choices that require further evaluation, as well. The following web site is from the Nickel Development Institute. They have two publications that are worth down loading, and reviewing, to help you evaluate and select a suitable material;

http://www.nickelinstitute.org/index.cfm/ci_id/45.htm

The paper of interest is;
1. Paper 10043 titled - "Design, Water Factors Affect Service-Water Piping Material" by A. Turnhill

2. Paper 11003 - Ni Stainless Steel for Marine Environments, Natural Waters and Brines

 

[EdStainless]

met, you beat me to posting those links. Those are good ones.

topgun, you reallly want to select one material and stick with it. Once you have done some looking and reading come back, and we can talk about the pros and cons to the way that some other plants have handled this problem.

What is this line for? Is it considered 'saftey critical'? In the US would it be Div III NCA 3800 material? If so that might be the biggest factor in material availability.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[metengr]

Ed;
That's what happens when you visit Power Plants, and adapt to 6AM starting time. In my corporate office it is a completely different world, which is why I only go the office no more than 2 days a week.

 

[andyenergy]

topgun -

Has this been discussed with the Engineering Dept of BE? I'm quite close to this organisation and was unaware of the need for replacement of C/S pipework until the original post.

Metengr / Edstainless

Good, sensible advice for this stage of enquiry. Needs more thought and consideration IMO. If there's a problem with the existing line (whatever this is) then perhaps we ought to be finding out what the problem (and the consequences for similar lines) is rather than simply changing the material and introducing a load of extra problems - fabrication, termination, protection etc. One thing is for sure, the replacement cost would be significantly more expensive.

 

[topgun67]

Thanks for all your help guys.
This has gone through various stages of approval and Titanium is the only method of consideration. We have now managed to procure the relevant size and grade of material and a suitable valve.
Any other thoughts on this subject would be most welcome.
To Andyenergy; Would be interested to know if we deal with the same people?

 

[andyenergy]

Topgun -

The answer is yes. The reason that I raised the question is because as a member of ED, I'm a regular vistor to these forums in order to increase my knowledge and to learn best practice. I've learnt a lot from many of the correspondents and was surprised to see the query being raised when many of my colleagues where unaware of this modification. I have no problems with the responses of Metengr and EdStainless both of whom have consistently provided excellent and pragmatic advice to others in the past. All I want to finish with is that we have our own engineers who can provide support and advice - please use them.

Regards